Nano Energy
·
2016
·
IF 11.553
Zhenghui Pan,Yongcai Qiu,Jie Yang,Fangmin Ye,Yijun Xu,Xinyi Zhang,Meinan Liu,Yuegang Zhang
Three-dimensional (3D) porous current collector is effective in enhancing the energy density per surface area of batteries and supercapacitors due to its ability for high mass loading of active materials and efficient electron and ion transport. Herein, we report a facile method to construct a nanoporous Ni architecture on the surfaces of flexible carbon cloth (Ni@CC). By electrodeposition of ultrathin MnO x nanosheets on the 3D Ni@CC nanoporous current collectors, we achieved an areal specific capacitance of 906.6 mF cm −2 at 1 mA cm −2 , which is much higher than 353.2 mF cm −2 using bare CC as the current collector. Employing the 3D MnO x @Ni@CC positive electrode and a chemically converted graphene (CCG) negative electrode , we assembled a flexible all-solid-state asymmetric supercapacitor (AASC) in a Na 2 SO 4 /polyvinyl alcohol (PVA) gel electrolyte. The AASC can achieve a superior energy density of 1.16 mW h cm −3 at a current density of 1 mA cm −2 and excellent cyclability with 81.5% capacity retention after 10,000 charging/discharging cycles. More importantly, the AASC can maintain over 85.7% of its original capacitance even after 200 bending cycles. These results demonstrate the great potential for application of 3D Ni@CC scaffolds in flexible, high performance wearable electronics and energy storage devices.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Yanliang Zhai,Yunshan Shang,Luoming Zhang,Xiaoling Meng,Yanjun Gong,Lirong Zheng,Jing Zhang,Ping Liu
Hydrothermally modified nanosheet ZSM-5 zeolite by directly using MnO x nanoparticles was carried out and this substantially offered a high performance catalyst for methanol to propylene (MTP) reaction. The properties of as synthesized ZSM-5 nanosheets with different MnO x amounts (NS-x) were compared with ZSM-5 nanosheets modified by impregnation method (IM-0.5) and physically mixed method (PM-0.5), respectively. The initial state of MnO x nanoparticles was close to Mn 2 O 3 with 20 nm in size. XRD , H 2 -TPR and XAFS results confirmed under high temperature hydrothermal condition, the Mn 2 O 3 nanoparticles disaggregated into Mn 2 O 3 clusters and entered the framework defects of nanosheet zeolite with high dispersion. Infrared spectra of hydroxyl groups (OH-IR) showed that the Mn 2 O 3 clusters were bonded with silanol defects both on the surface and inside zeolite, which substantially increased the stability of Mn 2 O 3 clusters and healed the framework defects. In contrast, the Mn species in the impregnated sample was close to the co-existence of Mn 2+ ions and MnO 2 nanoparticles with 2–3 nm, no interaction between Mn species and Si–OH group was determined. Notably, the typical sample (NS-0.5) with MnO x cluster modification performed much higher propylene selectivity and catalytic stability (~52%, 240 h, WHSV = 3 h −1 ), while the conventional IM-0.5 and PM-0.5 showed poor propylene selectivity (48%, 46%) and catalytic stability (166 h, 133 h) in MTP reaction. The excellent result should be attributed to the subtle control of external strong acid and the less structural defects, due to specific existence of bonded Mn 2 O 3 clusters.
研究领域:
化学
·
材料科学
·
催化
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Yanping Zhang,Yinian Zhu,Yinming Fan,Shengpeng Mo,Xiaobin Zhou,Zongqiang Zhu
A set of MOFs-derived Co 3 O 4 @MnO x hollow-sphere were synthesized to develop a catalyst for the photothermal catalytic removal of NO using acetone as a reducing agent. The study systematically investigated the impact of organic ligands and photoactive substances on energy transfer and photothermocatalytic reactions involving acetone and NO under 5 vol % H 2 O with the catalysts. At 240°C, sample C-5/1 (with an organic ligand added and Co/Mn molar ratio of 5/1) demonstrated 75 % NO conversion and 65 % acetone conversion. The highest catalytic performance was observed in the L-Py sample (with photoactive substance was added), achieving 80 % NO and 69 % acetone conversion at 240°C. The catalyst demonstrated low crystallinity, and the introduction structural defects through ligands adjusted the ratio of active components. Meanwhile, enhanced catalytic performance was attributed to light energy scattering in the inner space of microspheres, resulting in the efficient transfer of 2.17 eV energy with the addition of two photoactive substances. The elevated concentration of surface-active oxygen facilitated oxidation, while M n /M n+1 (Mn 3+ /Mn 4+ and Co 2+ /Co 3+ ) redox cycling supplied surface oxygen in the photothermal low-temperature response. The proposed mechanism for the simultaneous degradation of acetone and NO was elucidated using Density Functional Theory calculations.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lu Zhang,Meng Zhang,Xiaozhe Song,Hui Wang,Zhaoyong Bian
Here, we report enhancement of the photoelectrochemical (PEC) performance of MnO x /graphite-like carbon nitride (g-C 3 N 4 ) nanocomposites synthesized by one-step thermal decomposition for degradation of clofibric acid (CA). MnO x showed enhanced broadband ultraviolet–visible light regions, efficient charge generation–separation, and enhanced PEC performance when combined with g-C 3 N 4 . Photogenerated holes can be efficiently captured by introducing Mn 2+ /Mn 3+ /Mn 4+ valence band transitions. In addition to a good visible-light response, the MnO x /g-C 3 N 4 -10 (g-C 3 N 4 with 10% Mn(NO 3 ) 2 ·6H 2 O) photoanode showed enhanced photocurrent density of 0.03 × 10 −3 A cm −2 at 0.63 V vs. Ag/AgCl, which was approximately 100 times that of pristine g-C 3 N 4 . The superoxide radical and positive holes played dominant roles in PEC degradation of CA. The MnO x /g-C 3 N 4 -10 photoanode showed the highest photoelectrocatalytic performance under acidic conditions because of electrostatic attraction between the electrode and CA. The CA degradation ratio using the MnO x /g-C 3 N 4 -10 photoanode was 100% under visible light in 6 h at pH = 3. This work provides a simple and sustainable strategy to modify g-C 3 N 4 for captured holes to improve PEC degradation of CA, and it is promising for application to different materials in a variety of fields.
研究领域:
材料科学
·
环境科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yan Chen,Yufan Liu,Huizhen Jin,Xinyue Wang,Guowen Wang,Hongchao Ma,Vadivel Subramaniam,Krishnamoorthy Ramachandran,Xinghui Liu
Antibiotic drugs are biotoxic and difficult to degrade, causing irreversible effects on aquatic environment and human health. The photoelectrocatalytic (PEC) process is regarded as a promising strategy for simultaneously addressing environmental pollution and the energy crisis. Herein, a plum tree-type composite semiconductor photoanode MnOx@Co/NC-x with core-shell heterostructures was constructed to evaluate the PEC activity for sulfamethoxazole (SMX). The synergistic effects of Co nanoparticles, a high content of graphitic N, an open framework, and interfacial structures played a decisive role in improving the PEC activity of the MnOx@Co/NC-x system. The engineered micro-nano structure significantly improved the specific surface area and conductivity of electrode materials, and promoted the diffusion of electrolyte. Among them, MnOx@Co/NC-500 photoanode exhibited the best performance (reached 98.92% in 50 min), cyclic stability and repeatability. The results showed that it was feasible to construct a high-performance heterostructural interface for pollutant treatment based on micro-nano structure regulation and valence band matching.
研究领域:
环境催化
·
材料化学
·
环境污染治理
·
纳米材料
·
电化学
·
光化学
·
药物降解
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Xiaonan Li,Siman Luo,Yu Chen,Yucheng Zuo,Yue Huang,Hong Zhang,Liheng Chen,Jun Feng,Jing-Yi Zhu,Wei Xue
Inspired by the effective interfacial interactions between natural creatures (e.g., cockleburs and viruses) and their bio-hosts, we developed a novel gold-manganese oxide nanoparticle (Au-MnOx) nanoenzyme with a spiky surface for NIR-II light-induced synergistic antibacterial therapy. Au-MnOx with favorable photothermal performance and peroxidase-like activity could achieve combined photothermal therapy (PTT)/chemodynamic therapy (CDT) under NIR-II irradiation with a low concentration. Of special note, the spiky surface endows Au-MnOx robust bacterial adhesion, in turn favoring the following synergistic PTT/CDT through effective interaction between Au-MnOx and bacteria. In vitro results display that our combined antibacterial nanoplatforms possess the broad-spectrum antibacterial ability against both Escherichia coli (E. coli, Gram-negative) and Staphylococcus aureus (S. aureus, Gram-positive). Moreover, satisfactory in vivo bactericidal efficacy and good cytocompatibility could be obtained in the rat wound model with the mixed bacterial infections. This study puts forward a facile one-pot method to establish the well-designed Au-MnOx nanozymes with a spiky surface for NIR-II light-enhanced bacterial elimination. The meteor hammer-like Au-MnOx holds great potential in construction of a novel antibacterial treatment system to settle the overuse of antibiotics.
研究领域:
纳米技术
·
生物医学工程
·
材料科学
·
抗菌治疗
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Xiao Zhang,Xueying Zhang,Cai Liang,Feng Shen,Boxiong Shen
Water poisoning remains a significant challenge for Mn-based catalysts in the purification of low-temperature industrial flue gas. In this study, a water-resistant catalyst, Cu-doped MnO x dispersed on a flower-like hollow sphere carrier (Cu 0.1 Mn 1 -Al 2 O 3 (NF)), was developed. The introduction of 5 % water vapor into simulated flue gas reduced the o-xylene oxidation efficiency of the unmodified MnO x /γ-Al 2 O 3 catalyst by 20 %, whereas Cu 0.1 Mn 1 -Al 2 O 3 (NF) exhibited only a 5 % reduction, and it shows a water resistance surpasses those of most of the reported MnO x catalysts. Upon water vapor withdrawal, Cu 0.1 Mn 1 -Al 2 O 3 (NF) showed a 2 % irreversible efficiency loss, compared to 9 % for MnO x /γ-Al 2 O 3 . Mechanistic studies highlight the role of the flower-like morphology in reducing hydrogen-bonded H 2 O and the primary contribution of Cu + doping in suppressing –OH generation on metal sites, likely due to weakened H 2 O dissociation at Mn-Ov-Cu oxygen vacancies. Additionally, Cu 0.1 Mn 1 -Al 2 O 3 (NF) has improved water desorption capability evidenced by 8 °C lower endothermic temperature for H 2 O volatilization than that of MnO x /γ-Al 2 O 3 . Furthermore, a H 2 O-involved Mars-van Krevelen (MvK) mechanism was proposed to explain the ∼ 2 % irreversible efficiency reduction for Cu 0.1 Mn 1 -Al 2 O 3 (NF) in wet gas − attributed to H 2 O dissociation at oxygen vacancies hindered lattice oxygen replenishment. Based on this mechanism, an air-purging regeneration protocol was developed to enhance the catalyst’s operational stability under wet flue gas conditions.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Mengyao Xiao,Zihong Liao,Zhitao Zhang,Zhihong Wang,Yi Wu,Rui Chen,Dachao Lin,Xing Du
Decentralized water supply is threatened by manganese pollution, especially in rural areas where groundwater is used as the main water source. This study aimed to establish a novel dual-mode membrane bioreactor (DMBR) with functionalized PAC-MnOx filters to effectively treat manganese-contaminated groundwater. DMBR operation modes could be switched by applying different filter fluidization strategies. In general, DMBR without filter fluidization (FIX-MBR) achieved 43 % better manganese removal than that with filter fluidization (FLU-MBR). Additional carbon sources stimulated manganese oxidizing bacteria (MnOB) activities for biologically oxidizing manganese, after which lamella-like structure birnessite with abundant active sites for concentrating and oxidizing manganese gradually formed. These processes facilitated the transformation of MnOx into birnessite, establishing a virtuous circle for autocatalytically oxidizing manganese. In FLU-MBR, dynamic stirring induced pulsed upwelling and enhanced membrane shear force (max = 2.20 Pa). Cake layer was timely removed and membrane flux was notably increased from 0.71 L/m 2 ·h to 12.57 L/m 2 ·h. As evidenced by increasing membrane permeability (37 L/m 2 ·h) and stable manganese removal (83.73 %), DMBR further benefited from increasing TMP from 0.01 MPa to 0.07 MPa. Exogenous mature birnessite enabled the rapid startup of DMBR, which effluent manganese fully satisfied the Standard for drinking water quality in China (GB5749-2022).
研究领域:
环境工程
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Shidong Song,Wanjun Li,Ya-Ping Deng,Yanli Ruan,Yining Zhang,Xuhui Qin,Zhongwei Chen
Zn-air batteries (ZABs) represent promising candidates for the next generation energy conversion and storage systems based on their superior features to those of lithium-ion batteries, including high theoretical energy density , low cost, and high safety. However, their further development and application is severely lagged due to the lack of high efficient and durable bifunctional oxygen electrocatalysts . The widely applied carbon-based catalysts are thermodynamically instable during battery charging. Herein, TiC supported amorphous MnO x (a-MnO x /TiC) is reported for the first time as electrocatalyst for the corrosion resistant oxygen electrodes of ZABs. A-MnO x /TiC delivers a remarkable activity and stability toward both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) with a high half-wave potential (0.8 V) for ORR and a low potential (1.56 V) at 10 mA cm −2 for OER, which far outperforms the state of the art ORR catalyst (Pt/C) and OER catalyst (IrO 2 ), as well as the Pt/C-IrO 2 and a-MnO x /C bifunctional catalysts . The excellent bifunctional activity of a-MnO x /TiC can be attributed to the efficient synergistic effect between the active amorphous MnO x catalyst and the highly conductive and stable TiC support. More impressively, a-MnO x /TiC demonstrates an outstanding electrochemical stability in strong alkaline electrolyte under OER condition in contrast to the readily oxidized carbon-based a-MnO x /C catalysts. ZAB with a-MnO x /TiC delivers a greater discharge performance with a peak power density of 217.1 mW cm −2 than that of Pt/C-based ZAB, and a surpassing discharge and charge cycling performance and stability to ZABs with Pt/C-IrO 2 and a-MnO x /C. Furthermore, a-MnO x /TiC can be applied for solid-state ZABs which exhibit excellent mechanical flexibility and cycle stability under their flat and bent states. The a-MnO x /TiC bifunctional electrocatalyst with extraordinarily high activity and electrochemical stability provides a promising approach for exploring corrosion resistant electrocatalysts for Zn-air batteries with high efficiency and long-term cycling stability.
研究领域:
电化学
·
能源存储与转换
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Boge Zhang,Yongjie Shen,Biyuan Liu,Jian Ji,Wenjing Dai,Pingli Huang,Dengsong Zhang,Guangqin Li,Ruijie Xie,Haibao Huang
Ozone catalytic oxidation (OZCO) has gained great interest in environmental remediation while it still faces a big challenge during the deep degradation of refractory volatile organic compounds (VOCs) at room temperature. Hydroxylation of the catalytic surface provides a new strategy for regulating the catalytic activity to boost VOC degradation. Herein, OZCO of toluene at room temperature over hydroxyl-mediated MnOx/Al2O3 catalysts was originally demonstrated. Specifically, a novel hydroxyl-mediated MnOx/Al2O3 catalyst was developed via the in situ AlOOH reconstruction method and used for toluene OZCO. The toluene degradation performance of MnOx/Al2O3 was significantly superior to those of most of the state-of-the-art catalysts, and 100% toluene was removed with an excellent mineralization rate (82.3%) and catalytic stability during OZCO. ESR and in situ DRIFTs results demonstrated that surface hydroxyl groups (HGs) greatly improved the reactive oxygen species generation, thus dramatically accelerating the benzene ring breakage and deep mineralization. Furthermore, HGs provided anchoring sites for uniformly dispersing MnOx and greatly enhanced toluene adsorption and ozone activation. This work paves a way for deep decomposition of aromatic VOCs at room temperature.
研究领域:
环境科学
·
催化
·
化学工程
·
大气化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Tian Gu,Chengzhi Wang,Denghui Chen,Mengmeng Han
Modulating the physicochemical properties of catalysts through the construction of special crystal structures or microscopic morphology provides new insights for developing high-performance low-temperature denitrification catalysts. This paper explores the effect of morphology structure on catalyst performance and identifies the dominant driving factors. The catalyst activity sequence was found to be MnO x spiny nanospheres (Mn-SNS) > MnO x nanowires (Mn-N) > MnO x nanospheres (Mn-NS) > MnO x nanoparticles (Mn-P). Among these, the Mn-SNS catalyst prepared by the hydrothermal method exhibited the best catalytic activity and the good resistance to water and sulfur. It achieved over 70% NO x conversion at 150 °C, and maintained 100% at 200–350 °C. In the presence of SO 2 and H 2 O, the NO x conversion was maintained at 87%. The spherical structure consisting of nanospikes provides the Mn-SNS catalysts with a large specific surface area, more (Mn 4+ +Mn 3+ ), abundant acid sites, and stronger reducibility, thus exhibiting excellent performance through the "fast-SCR" pathway. It also inhibits oxide crystallization and provides more sites for the adsorption activation of NO x and NH 3 . The nanowire structures can provide a large specific surface area and a high concentration of Mn 3+ and Mn 4+ for MnO x catalyst. Characterization analyses revealed that the specific surface area, the ratio of (Mn 4+ +Mn 3+ )/Mn, and the number of Lewis acid sites (L-NH 3 ) are the most important factors affecting the catalytic activity. This present empirical analysis provides new ideas for designing high-performance catalysts with a large specific surface area.
研究领域:
环境科学
·
催化科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 8
·752
·
IF 4
Yulin Sun,Yiwei Zhang,Yong He,Wubin Weng,Yanqun Zhu,Zhihua Wang
Metal–organic frameworks (MOFs) have become a hot topic in various research fields nowadays. And MOF-derived metal oxides prepared by the sacrificial template method have been widely applied as catalysts for pollutant removal. Accordingly, we prepared a series of MOF-derived MnOxcatalysts with diverse morphologies (rod-like, flower-like, slab-like) via the pyrolysis of MOF precursors, and the as-prepared MnOxcatalysts demonstrated superior performance compared to the one prepared using the co-precipitation method. MnOx-II, with a flower-like structure, exhibited excellent activity for formaldehyde (HCHO) catalytic ozonation at room temperature, reaching complete HCHO conversion at O3/HCHO of 1.5 and more than 90% CO2selectivity at an O3/HCHO ratio of 2.5. On the basis of various characterization methods, it was clarified that the enhanced catalytic performance of MnOx-II benefited from its larger BET surface area, abundant oxygen vacancies, better redox ability at lower temperature, and more Lewis acid sites. The H2O resistance and stability tests were also conducted. Furthermore, DFT calculations substantiated the enhanced adsorption of HCHO and O3on oxygen vacancies, while in–situ DRIFTS measurements elucidated the degradation pathway of HCHO during catalytic ozonation through detected intermediates.
研究领域:
环境催化
·
材料科学
·
污染物去除
·
纳米材料
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）